3D model of a compressed air energy and use system. It is a three stage compressor system, consisting of a rotary vane compressor (first stage), rotary screw compressor (second stage), rotary screw compressor (third stage). The compressor system sits in the red box; the blue box contains a (single-stage) rotary vane motor. Perhaps that using several stages for the motor aswell can increase efficiency. The heat that is generated due to the compressing of the air is removed by means of an oil system. The heated oil (along with cooling air from a ventilator) is then used to power a stirling motor which generates electricity (using an alternator) that is supplied into the mains electricity system. This effectively reduces the energy losses of the compressor, by using the mains electricity system as a buffer. The power produced can be reused to heat oil for the motor-side of the CAES&US (this using heater elements). Also note that the boxes also contain leftover heat & cold and mix them together to reduce energy losses. See the "Purchasing_the_models" link at appropedia's AT_CAD_Team for additional information on the model